The grey plastic plenum in front of the upper cabinet and above the back seat. This is on an ‘87. Earlier vans might be different. 

Stephen

Mobile

> On Jul 25, 2022, at 8:14 PM, Mike Miller <mwmiller6@att.net> wrote:
> 
>  Do you mean the whole upper cabinet or the plenum inside?
> 
>    On Monday, July 25, 2022, 4:59:39 PM PDT, Stephen Grisanti <bike2vcu@yahoo.com> wrote:  
> 
> Never removed those but I did remove the whole plastic plenum and now get mucho airflow to the front. Doing this does leave an unfinished look to the front of the upper cabinet but some have fashioned grilles to dress things up. I haven’t bothered. 
> 
> Stephen
> 
> Mobile
> 
>> On Jul 25, 2022, at 6:09 PM, Mike Miller <mwmiller6@att.net> wrote:
>> 
>> Volkers,
>> Someone posted that the A/C in a westy is more effective without the plastic vent guides on the outflow. Anyone know how to remove these without breaking them? It's not in Bentley that I could find.
>> Mike from Cotati
> 
>